Prisma 7: “The datasource property url is no longer supported" – Here's the Fix

Ran prisma migrate dev and got this error?

The datasource property url is no longer supported in schema files.
Move connection URLs to prisma.config.ts

What changed?
Prisma 7 moved the database URL from schema.prisma to a new file:
prisma.config.ts.

Fix:
Remove url from schema.prisma:

datasource db {
  provider = "postgresql"
}

Create prisma.config.ts in your project root:

import 'dotenv/config'
import { defineConfig } from 'prisma/config'

export default defineConfig({
  datasource: {
    url: process.env.DATABASE_URL!,
  },
})

Run npx prisma generate

That's it. Your database URL now lives in the config file, not the schema.
Why? Cleaner separation: models stay in schema.prisma, config goes to prisma.config.ts.